/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMModel/Nodes/RigVMVariableNode.h
The Variable Node represents a mutable value / local state within the the Function / Graph. Variable Node's can be a getter or a setter. Getters are pure nodes with just an output value pin, while setters are mutable nodes with an execute and input value pin.
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)(BlueprintType) class URigVMVariableNode : public [URigVMNode](API\Plugins\RigVMDeveloper\RigVMModel\URigVMNode)